| 摘要 |
A linear precision guide comprises a guide rail (1) having an outer profile of a prismatic shape inscribed in a circle and exhibiting three arcs (3, 4). The arcs (4) are equal and their successive extremities (5) are connected by a lower plane side-face (6). The four other extremities (8) of the arcs are connected by two recessed plane sides (9). Each of the recessed plane sides comprises outer connections in the form of circular rail recesses (10). Said recessed sides and recesses serve, following precision-grinding, for races of sets of movable balls (19, 19a) supported on the wings (17) of the block (14) enclosing the rail (1) supported on the grooves and ducts (18, 21). The sets of balls (19, 19a) are supported by means of a lower housing (25) and of a tongue (32). Said housing (25) is provided with inner circular grooves (29) allowing the recirculation of the lower balls (19) during the displacement of the block (14). The block (14) is provided with a borehole duct (24) for the recirculation of the intermediary balls (19a). The connection of the grooves (18), ducts (21), grooves (23) and borehole duct (24) is provided by circular grooves provided at the ends of the housing (25) and on the end parts.
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